Is this a chip burnt?

shidizai

Is this a chip burnt? [Copy link]

When using jtag to download the program for MSP430F149, it works well at first, but sometimes the prompt shown in the picture will appear after the board runs for a while. Sometimes it will prompt 148, and sometimes it will not recognize it at all. The interesting thing is that once it prompts 148, you can continue to download the program by selecting the 148 model. The unrecognized ones can still execute the functions correctly, but if you want to re-download the program, you can only change the chip. I have never encountered this situation before, please help me. The circuit is 430 controlling the MOS tube switch, which is the circuit in the picture. There are 12 groups in total. One is turned on every 1s, and it works in a cycle. J20 is a solenoid valve, and the working current is 600mA when it is turned on. VCC_VALVE is 36V.

qwerghf

Check the circuit problem, it seems that the power supply is not right

shidizai

qwerghf posted on 2017-12-26 09:38 Check the circuit problem, it seems that the power supply is not right

Thank you for your help. This is the power supply circuit. First use a DCDC to convert 36 to 5V, and then use 1117-3.3 to convert 3.3V. When the above problem occurs, the power supply voltage is normal.

qwerghf

Shidizai posted on 2017-12-26 09:42 Thank you for your help. This is the power supply circuit. First, a DCDC is used to convert 36 to 5V, and then 1117-3.3 is used to convert 3.3V. When the above problem occurs, the test...

Which wires are connected to the emulator and the board, and how is the VCC of the emulator connected?

shidizai

qwerghf posted on 2017-12-26 09:55 Which wires are connected between the emulator and the board, and how is the VCC of the emulator connected?

JTAG is directly connected to 430, and so is the power supply. When using jtag to download the program, no external power supply is added.

qwerghf

You cannot use the emulator to power the download with a load. If you download with a load, do not connect the emulator VCC

shidizai

qwerghf posted on 2017-12-26 10:09 You cannot use the emulator to power the download with a load. If you download with a load, do not connect the emulator VCC

In the entire circuit, only the main control uses 3.3V, and the emulator's VCC is only connected to 430, which is equivalent to no load, right?

ddllxxrr

If the program can be downloaded, the chip must be fine.

landao_gd

Maybe the level of your target board and JTAG are not equal, resulting in unstable signal. You can try to use the power supply of the target board (the 3.3V group) to power the jtag level IC. I can't remember whether it is pin 2 or pin 4 on the JTAG. One is the 244 power supply inside, and the other is the 3.3V supply of the target board (to be disconnected).

shidizai

ddllxxrr posted on 2017-12-26 10:22 If you can download the program, the chip must be fine

It can't be considered as being able to download the program. 1. There was no problem with the first few downloads of the new 149. 2. When there is a problem, some 149 chips will be recognized as 148, and then you have to select 148 in the iar to download, and some 149 will never be recognized, and you can no longer download the program. I just don't know where the problem is that causes this phenomenon, the program? The hardware? If it is the jtag, it will not affect the chip.

shidizai

landao_gd posted on 2017-12-26 10:54 Maybe the level of your target board and JTAG are not equal, resulting in unstable signal. You can try to use the power supply of the target board (the 3.3V group) to power the jtag level IC...

Thank you for your reply. I don’t think it’s a problem with jtag or jtag circuit. I used it in this way before. Even if there is an occasional download error, it will not affect the chip. Now, once there is a problem, the chip can no longer be programmed (iar cannot recognize the chip), instead of being unable to download the program.